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Warnings which are not consistent for the same magnitude of current

AnjanKumar

 Sir,

 I am trying to find the critical charge of a node by using current double exponential model I=Qt K (exp(-t/t1)-exp(-t/t2)). I am injecting a current which follows the above form. To find the critical charge I sweep the value 'Qt' until a change in the data is observed. 

Simulating D-Latch

1. when Qt=17fC there is no change in the circuit. ----- No warnings

2. when Qt=50fC there is a change in the circuit. ---- There is a warning about bulk drain junction current has exceeded the limit

3. Now after simulating Qt=50fC when I change Qt to 17fC, cadence issues a warning which was not observed before (when I simulated Qt=17fC for the first time).
After that warning even if I decrease Qt the warning continues to persist.  I don't understand what is the problem.

  • I don't understand what the problem is either. Mainly because you didn't provide enough information. 

    Please read your post and consider whether anyone could possibly answer your question without the additional knowledge that resides in your head  (actually there wasn't even a question in your email - you just said that you don't understand). Please carefully read the Forum Guidelines and make sure you've provided sufficient information. Otherwise you won't stand much chance of getting an answer from anyone.

    Kindest Regards,

    Andrew.

     

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